ACE_Errno_Guard Class Reference

Provides a wrapper to improve performance when thread-specific errno must be saved and restored in a block of code. More...

#include <OS_Errno.h>

Public Member Functions
	ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref, int error)
	ACE_Errno_Guard (ACE_ERRNO_TYPE &errno_ref)
	Initialize the errno_ptr_ to the address of errno_ref.
	~ACE_Errno_Guard ()
	Reset the value of errno to <error>.
int	operator= (int error)
	Assign erro> to error_.
bool	operator== (int error)
	Compare error with error_ for equality.
bool	operator!= (int error)
	Compare error with error_ for inequality.

Private Member Functions
	ACE_Errno_Guard (const ACE_Errno_Guard &)=delete
ACE_Errno_Guard &	operator= (const ACE_Errno_Guard &)=delete

Private Attributes
int	error_

Detailed Description

Provides a wrapper to improve performance when thread-specific errno must be saved and restored in a block of code.

The typical use-case for this is the following: int error = errno; call_some_function_that_might_change_errno (); errno = error; This can be replaced with { ACE_Errno_Guard guard (errno); call_some_function_that_might_change_errno (); } This implementation is more elegant and more efficient since it avoids an unnecessary second access to thread-specific storage by caching a pointer to the value of errno in TSS.

Constructor & Destructor Documentation

ACE_Errno_Guard() [1/3]

ACE_Errno_Guard::ACE_Errno_Guard ( ACE_ERRNO_TYPE & errno_ref, int error )

inline

Stash the value of error into error_ and initialize the errno_ptr_ to the address of errno_ref.

ACE_Errno_Guard() [2/3]

ACE_Errno_Guard::ACE_Errno_Guard ( ACE_ERRNO_TYPE & errno_ref )

inline

Initialize the errno_ptr_ to the address of errno_ref.

~ACE_Errno_Guard()

ACE_Errno_Guard::~ACE_Errno_Guard ( )

inline

Reset the value of errno to <error>.

ACE_Errno_Guard() [3/3]

ACE_Errno_Guard::ACE_Errno_Guard ( const ACE_Errno_Guard & )

privatedelete

Member Function Documentation

operator!=()

bool ACE_Errno_Guard::operator!= ( int error )

inline

Compare error with error_ for inequality.

operator=() [1/2]

ACE_Errno_Guard & ACE_Errno_Guard::operator= ( const ACE_Errno_Guard & )

privatedelete

operator=() [2/2]

int ACE_Errno_Guard::operator= ( int error )

inline

Assign erro> to error_.

operator==()

bool ACE_Errno_Guard::operator== ( int error )

inline

Compare error with error_ for equality.

Member Data Documentation

error_

int ACE_Errno_Guard::error_

private

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The documentation for this class was generated from the following files:

• OS_Errno.h
• OS_Errno.inl